William w



(No Model.) .Y

W. W. FORREST.

GRATE' BAR. V No. 349.639. Patented Sept. 21, 1886;

WITNESSES: -|NVENTO ATTORNEY.

N. PETERS. Fhom-Ulhugmpher, wasmn mn. D. c.

UNITED STATES PATENT OFFICE.

WILLIAM w. EoRREsT, or PHILADELPHIA, PENNSYL ANIA, AssieNoR or oNEHALE TO GEORGE s. HENSEL ANDsTEPHEN B. OOLLADAY, BOTH OF SAME PLACE.

GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 349,639, dated September 21,1886.

Application filed December 15, 1885. Serial No. 185,701.

To all whom it may concern:

Be it known that I,WII.LIAu W. FORREST, a citizen of the United States, residing in the city and county of Philadelphia, State of Penn- 5 sylvania, have invented a new and useful Improvement in Grate-Bars,which improvement is fully set forth in the following specification and accompanying drawings, in which- Figure 1 represents a side elevation of grate bars embodying my invention, the supports thereof being sectional. Fig. 2 represents a side elevation of one of the grate-bars on an enlarged scale. Fig. 3 represents a longitudinal vertical section thereof. Fig. at reprer5 sents a top or plan view thereof. Fig. 5 represents an end view thereof.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of a grate-bar that is light, strong, durable, may be kept cool, )I(3- vents the adhesion of clinkers, serves to increase combustion, and possesses other advantages, as will be hereinafter fully set forth.

Referring to the drawings, A represents a 2 grate-bar embodying my invention, the same being formed of an iron or steel tube, which is open at both ends and of such shape that in crosssection it resembles somewhat a wedge, the wider part being above, and on which the 0 fuel is supported. lhe ends of the bar are cut away inwardly and downwardly, thus reducing-the length of the bottom of the bar and directing the cold air into the bar, and said ends are provided with lips B, which are turned 3 5 horizontally in the lateral direction of the bar and form supports therefor, said lips resting on the frame or cross-bars of the grate, and aid in preventing any rocking or oscillating motion of the grate-bar. it will be seen that 40 the bar may be readily handled and set up, and it is light, strong, and durable; that clinkers are prevented from adhering to it, as only a small portion of the bar is exposed to the direct action of the heat of the furnace, and 2. r5 constant current of cold air is caused to flow into, through, and around the bar at all points, keeping it cold, it being known that clinkers only attack highly-heated surfaces. Furthermore, the bar is prevented from break- 53 ing or cracking from expansion or contrac- (No model.)

tion, or the use of fire-tools. The weight of the bar is less'than that of one made of castiron, whereby the bearing-bars are less liable to sag. As the bar is open at both ends and a short distance removed from the deadplate and back wall, there is avoided clogging of the fuel over the dead-plate and bearing ends of the bars, it being evident that the open-air space at each end of the furnace promotes a ready expansion of the bar in the 1011- gitudinal direction, thus preventing'the raising or lowering of'the bar at the middle thereof. As cold air from the ash-pit would flow into, around, and through the bar, the current of heated air passing from the interior of 65 the bar through the fuel, while it increases combustion by the air being nearer the temperature of the furnace, as the constant circulation of air from the inside takes place the heat of the bar is absorbed and carried away by the currents of cold air which pass between the bars. Again, the bar may be made of wrought-iron pipe or doubly-thick wroughtiron pipe or steel, and as but a small portion or surface of the bar is exposed to the fire, and

I may employ a bar of length sufficient to reach across the support-frame. By the em- 8 5 ployment of short bars having their ends opposite to but separated from each other, the extension of the said bars by the action of heat is permitted without the same being lifted at their ends, and at the same time the currents of 9c cool air from below the grate, which enter the bars at the cutaway portions, freely passfrom one bar to another.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is

1. A grate-bar formed of a tube of approximately wedge shape, having lips extending horizontally in the lateral direction of the bar, substantially as and for the purpose set forth. 10o

2. A tubular grate-bar having its ends out the said tubular bars having their open ends away inwardly and downwardly, and having opposite to but separate from each other, all IO lips extending from the sides at both ends, combined substantially as and for the purpose XVILLIAM \V. FORREST.

whereby the said bar is firmly held in position, 7 set forth. 5 substantially as described. 7

3. A grate having tubular bars of wedge- Witnesses: shaped form open at both ends, having cut- .TOHNLA. \VIEDERsHEIM, away lower ends, and a series of bearing-bars, A. 1. GRANT. 

